..Consistent with previous genetic analyses of 7 strains from Ivory Cost, Gambia and Togo, the analysis of these 34 Nigerian strains supports the hypothesis that the B. abortus biovar 3a lineage is dominant in West African countries. ..

..Critical review of the existing information is necessary both to select optimal tests according to the logistical means available and the epidemiological context, and to focus the development of new tests. ..